Hi Watoni! I'll give my reply for this question. Gabriel himself will probably see this thread and come along to answer. This is the set we're talking about, https://marketplace.roll20.net/browse/set/1266/sla
... The white spikes are supposed to represent Arrow Slits, those protective castle windows where an archer can shoot a bow-and-arrow out, while being very protected inside. They are not there for aligning graphics, they are intentionally part of the fortification-design art. But you don't have to use them! This art set of Fortifications includes many options and moveable parts. There are Building tiles and Turret tiles that have the white spikes, and there are other Building tiles and Turret tiles that do NOT have the spikes/windows. When you build and assemble your fortification map using these parts, you can skip over the ones with white spikes and just use the room designs that don't have the spikes. There are plenty of room-and-wall tiles to build an entire fortification using this set, without using the spikey ones. For example in the Octagon shaped Turrets, there are ones with Spikes, but there are also alternative versions without spikes, in both stone-floor and wood-floor and roof versions.